""In roughly 24 hours of collaboration, we built a complete expression language with a parser, type system, three compilers, a standard library, a CLI tool, and a documentation website. Not bad for a day's work," Lambeau and Claude wrote. "Elo isn't just a demonstration that AI can write code. It's a demonstration that humans and AI can build together - each contributing what they do best," they added."
""As an expression language that compiles to JavaScript, Ruby, and SQL, Elo is intended as a portable way to handle form validation, e-commerce order processing, and subscription logic. Lambeau, founder and CTO of Klaro Cards and CEO of app consultancy Enspirit, is not the first to develop a programming language with the help of AI. Steve Klabnik performed a similar feat last year with the Rue programming language.""
""Claude Code isn't the only AI-assisted programming method having a moment. AI biz Cursor created a rudimentary browser using OpenAI's GPT-5.2. And developer Ola Prøis used Cursor, powered by Claude, to create a Rust-based text editor called Ferrite. Claude users generally acknowledge that their pair partner makes mistakes. But those committed to AI assistance find it worthwhile to clean up after their helper.""
Bernard Lambeau, a Belgium-based software developer and founder of several technology companies, created a programming language called Elo with the help of Anthropic's Claude Code. Starting December 25, 2025, he published posts that named Claude as a co-author and described a roughly 24-hour collaboration that produced a parser, type system, three compilers, a standard library, a CLI tool, and documentation. Elo compiles to JavaScript, Ruby, and SQL for portable use in form validation, e-commerce order processing, and subscription logic. Other developers have similarly used AI tools to build languages, and users accept that AI helpers require human cleanup.
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